<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
      var money = prompt('输入现有金额') ;

      if(money >= 2000){
          alert('请大家吃西餐')
      }else  if(money >= 1500){
          alert('请大家吃快餐')
      }else  if(money >= 1000){
          alert('请大家喝饮料')
      }else  if(money >= 500){
          alert('请大家吃棒棒糖')
      }else{
          alert('把钱带够')
      }
    </script>
</body>
</html>